After you get to nugegoda,you proceed towards Maharagama.Pass the first colour lights after nugegoda,in the 138 route.Then you'll see a few spare part shops on the right side,by that time you'll reach a town,which is Delkada,if you go pass the traffic lignts further,there'll be many shops untill you reacn the Arpico.Its way easier than searching in Panchikawatta.Good Luck